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| Ramírez-romero, Eduardo; Molinero, Juan-carlos; Sommer, Ulrich; Salhi, Noussaiba; Kéfi - Daly Yahia, Ons; Daly Yahia, Mohamed Néjib. |
| Structural changes in plankton primary producers have large implications for food web dynamics, energy fluxes and the vertical export of biogenic particulate carbon. Here we examine phytoplankton data spanning the period 1993–2008 from the Bay of Tunis, southwestern Mediterranean Sea, in relation to long term hydroclimate variability. We show a conspicuous shift in the structure of the phytoplankton community characterized by an increase of small-sized species and diversity loss, revealing a dominance of smaller blooming diatoms and cyanobacteria. Such changes were concurrent with marked modifications in hydroclimatic patterns experienced in the Bay of Tunis consisting of a shift towards enhanced winter precipitation together with rising temperatures. This... |
| Tipo: Text |
Palavras-chave: Size structural changes; Diversity loss; Ocean warming; Nanophytoplankton; Phytoplankton diversity; Southwestern mediterranean. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00602/71405/76566.pdf |
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| Javidpour, Jamileh; Molinero, Juan-carlos; Ramírez-romero, Eduardo; Roberts, Patrick; Larsen, Thomas. |
| The proliferation of invasive marine species is often explained by a lack of predators and opportunistic life history traits. For the invasive comb jelly Mnemiopsis leidyi, it has remained unclear how this now widely distributed species is able to overcome long periods of low food availability, particularly in their northernmost exotic habitats in Eurasia. Based on both field and laboratory evidence, we show that adult comb jellies in the western Baltic Sea continue building up their nutrient reserves after emptying the prey field through a shift to cannibalizing their own larvae. We argue, that by creating massive late summer blooms, the population can efficiently empty the prey field, outcompete intraguild competitors, and use the bloom events to build... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00628/74047/73454.pdf |
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